New energy automobile power battery cooling liquid and preparation method thereof

Abstract

The application belongs to the technical field of battery cooling liquid, and particularly relates to a new energy automobile power battery cooling liquid and a preparation method thereof. The new energy automobile power battery cooling liquid comprises, in percentage by mass, 40-60% of dihydric alcohol, 0.2-3% of corrosion inhibitor, 0.1-0.5% of antioxidant, 0.1-0.5% of pH regulator, 0.01-0.05% of antifoaming agent, 0.005-0.015% of nano additive, and deionized water to make up the rest to 100%. The nano additive comprises ion type flaky nano mineral, nano palygorskite and nano diamond in a mass ratio of 3-5:0.1-0.5:0.1-0.5. The new energy automobile power battery cooling liquid has good low dielectric constant, high thermal conductivity and good storage stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery cooling liquid, and particularly relates to a new energy automobile power battery cooling liquid and a preparation method thereof. BACKGROUND

[0002] In recent years, new energy automobiles develop rapidly, and key components of new energy automobiles include power batteries, motors and electric systems. A large amount of heat is generated in the use process of power batteries due to high-power charging and discharging, and the thermal management system directly affects the use performance, use safety and use life of the power batteries. Common cooling methods of power batteries include air cooling, phase change and liquid cooling. The air cooling has insufficient heat dissipation capacity, and the phase change liquid cooling is not easy to be lightweight, so the two methods are limited in application in new energy automobiles.

[0003] The liquid cooling liquid needs to have low dielectric constant, high thermal conductivity and wide use temperature range. A Chinese patent with the authorization publication number CN108841363B discloses a pure electric vehicle cooling liquid and a preparation method and application thereof. The cooling liquid includes the following raw materials in parts by weight: N-(2,3-dichloro-6-amino-benzyl) glycine ethyl ester 3-10 parts, nano metal oxide 1-5 parts, dihydric alcohol 40-50 parts, zirconium sand 4-10 parts, sodium dodecyl benzene sulfonate 4-10 parts, 2-mercapto-4,6-dimethoxy pyrimidine 3-8 parts, boric acid 2-8 parts and water 55-65 parts. The cooling liquid meets the requirements of the cooling liquid for power batteries in pure electric vehicles, has significant cooling effect and can realize industrial production. However, the freezing temperature of the technical solution is in the range of-35℃ to-28℃, and the anti-freezing performance needs to be improved.

[0004] A Chinese patent with the publication number CN117844456A discloses an ultra-low conductivity nanofluid cooling liquid and a preparation method and application thereof. The cooling liquid is prepared from the following components in mass percentage: base liquid 94-97%, isooctanoic acid 1.0-2.0%, methyl benzotriazole 0.1-1.1%, anti-rust agent 0.05-0.25%, ethylenediaminetetraacetic acid 0.009-0.1%, sodium molybdate 0.05-0.1%, defoaming agent 0.003-0.015%, colorant 0.002-0.004%, natural layered nanosheet 0.006-0.018% and pH adjuster 0.2-0.8%. The base liquid is composed of water and ethylene glycol, and the natural layered nanosheet is selected from at least one of the following: hydrotalcite, kaolin, bentonite and serpentine. However, the conductivity of the technical solution is greater than 10 us.

[0005] In addition, the above technical solutions all add nanomaterials, but do not pay attention to the stability thereof. SUMMARY

[0006] Based on the defects existing in the prior art, the purpose of the present application is to provide a new energy automobile power battery cooling liquid and a preparation method thereof. The new energy automobile power battery cooling liquid of the present application uses specific nano additives and antifoaming agents, so that the new energy automobile power battery cooling liquid has good low dielectric constant, high thermal conductivity and good storage stability.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] The present application provides a new energy automobile power battery cooling liquid in the first aspect, by mass percentage, the raw materials include: dihydric alcohol 40-60%, corrosion inhibitor 0.2-3%, antioxidant 0.1-0.5%, pH regulator 0.1-0.5%, antifoaming agent 0.01-0.05%, nano additive 0.005-0.015%, deionized water makes up the balance to 100%;

[0009] The nano additive includes ion type sheet nano mineral, nano palygorskite and nano diamond with a mass ratio of 3-5:0.1-0.5:0.1-0.5.

[0010] Preferably, the ion type sheet nano mineral includes montmorillonite nanosheet and / or hydrotalcite nanosheet.

[0011] The montmorillonite nanosheet in the present application is obtained by exfoliating montmorillonite, and the montmorillonite and the exfoliating method are not specifically limited. The montmorillonite can include but is not limited to sodium-based montmorillonite, calcium-based montmorillonite, etc.; and the exfoliating method can include but is not limited to ultrasonic exfoliation, mechanical exfoliation, etc.

[0012] Preferably, the sheet diameter of the montmorillonite nanosheet is less than 600 nm, and the thickness is less than 10 nm.

[0013] Further preferably, the sheet diameter of the montmorillonite nanosheet is 300-600 nm, and the thickness is less than 6 nm.

[0014] Most preferably, the sheet diameter of the montmorillonite nanosheet is 300 nm, and the thickness is less than 4 nm.

[0015] In the embodiment of the present application, the preparation method of the montmorillonite nanosheet is the preparation method disclosed in the patent with the authorized publication number CN111592862B, specifically: sodium-based montmorillonite is mixed with water, and a magnetic stirrer is used for fully stirring to make it uniformly dispersed to obtain a dispersion liquid, the dispersion liquid is placed in an ultrasonic crusher to perform exfoliation at an ultrasonic intensity of 450 W, after ultrasonic exfoliation, the solution is cooled to room temperature, and the next exfoliation is performed at the same ultrasonic intensity, and the ultrasonic exfoliation-cooling is repeated for 3 times, the ultrasonic time of each time is controlled to be about 5 min, and finally the mixed liquid is centrifuged and dried.

[0016] Likewise, the preparation method of the hydrotalcite nanosheet of the present application is not specifically limited, including but not limited to ultrasonic exfoliation, mechanical exfoliation.

[0017] Preferably, the flake diameter of the hydrotalcite nanosheet is 50-100 nm, and the thickness is 0.5-2 nm.

[0018] Further preferably, the flake diameter of the hydrotalcite nanosheet is 80 nm, and the thickness is 1.2 nm.

[0019] In an embodiment of the present application, the preparation method of the hydrotalcite nanosheet is the preparation method disclosed in the patent with the authorized publication number CN112661180B, specifically:

[0020] (1) Synthesis of NiFe hydrotalcite precursor: Ni 2+ and Fe 3+ are added to the reactor in a certain molar ratio (2:1) and mixed uniformly, a basic solution (NaOH, concentration 0.2 mol / L) is slowly added dropwise, the pH of the solution in the reactor is maintained at about 10, and the reaction is kept at room temperature for 10 h. After the reaction is completed, the product is washed by centrifugation with water and dried to obtain the NiFe-LDH hydrotalcite precursor.

[0021] (2) Preparation of ultrathin nanosheet by acoustic levitation method: the NiFe-LDH hydrotalcite precursor is uniformly dispersed in water to obtain a neutral dispersion solution of 10 mg / mL. A drop of the dispersion solution is placed in an acoustic levitation instrument, and the resonant frequency of the acoustic levitation instrument is adjusted to 10000 Hz to make the liquid drop suspended in the air. After successful suspension, the liquid drop does not contact the acoustic levitation instrument, and the dispersion solution is neutral during the suspension process. After 10 min of suspension, the liquid drop is collected.

[0022] Further preferably, the ionic flaky nanomineral includes montmorillonite nanosheet and hydrotalcite nanosheet in a mass ratio of 1:1.

[0023] Further preferably, the particle size of the nanopalygorskite is less than 1000 nm.

[0024] More preferably, the particle size of the nanopalygorskite is 20000 mesh.

[0025] Preferably, the particle size of the nanodiamond is less than 100 nm.

[0026] Further preferably, the particle size of the nanodiamond is 50 nm.

[0027] Preferably, the dihydric alcohol includes ethylene glycol and / or propylene glycol.

[0028] Preferably, the corrosion inhibitor is selected from at least one of methyl benzotriazole, benzotriazole, and mercaptobenzothiazole.

[0029] Preferably, the antioxidant comprises 2,6-di-tert-butyl-p-cresol and / or triphenyl phosphite.

[0030] Preferably, the antifoam agent is an organic silicon defoaming agent.

[0031] Further preferably, the defoaming agent is Addital FX580 produced by Hi-tech (Nanjing) Co., Ltd.

[0032] Preferably, the pH regulator comprises sodium hydroxide and / or potassium hydroxide.

[0033] The second aspect of the present application provides a preparation method of a new energy automobile power battery cooling liquid, comprising the following steps: uniformly mixing dihydric alcohol, a corrosion inhibitor, an antioxidant, a pH regulator, an antifoam agent, a nano additive and deionized water in proportion to obtain the new energy automobile power battery cooling liquid.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] 1. The new energy automobile power battery cooling liquid provided by the present application adds a nano additive, a main heat conduction network is formed by the random motion between ion-type sheet-shaped nanometer minerals, the ion-type sheet-shaped nanometer minerals are filled with nanometer palygorskite and nanometer diamond, the lap joint structure of the ion-type sheet-shaped nanometer minerals is changed, a high-pathway heat conduction network is formed, the thermal resistance is reduced and the diffusion capacity is enhanced, the heat conduction coefficient is improved, the storage stability is also improved (the fiber structure of the nanometer palygorskite inhibits particle sedimentation through physical entanglement, and the surface hydroxyl group of the nanometer palygorskite forms a hydrogen bond with the molecules of the base liquid to enhance the dispersion stability, and the rigid surface of the nanometer diamond reduces the van der Waals force attraction of the ion-type sheet-shaped nanometer minerals, thereby preventing agglomeration), and the new energy automobile power battery cooling liquid has low conductivity.

[0036] 2. When the ion-type sheet-shaped nanometer minerals comprise hydrotalcite nanosheets and montmorillonite nanosheets, the hydrotalcite nanosheets and the montmorillonite nanosheets can synergistically improve the heat conduction coefficient in the new energy automobile power battery cooling liquid provided by the present application.

[0037] 3. The present application unexpectedly finds that the stability of the new energy automobile power battery cooling liquid is improved by using a specific type of antifoam agent. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific implementation schemes are described in detail.

[0039] The application will be further described in connection with the following examples, but the application is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to different specific requirements, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each embodiment of the application can be combined with each other as long as they do not conflict with each other.

[0040] In the following examples and comparative examples, the raw materials used are commercially available or prepared by conventional methods in the art, unless otherwise specified.

[0041] Basic examples

[0042] Preparation of montmorillonite nanosheets: The preparation method disclosed in the patent with the authorized publication number CN111592862B is used, specifically: sodium-based montmorillonite is mixed with water at a ratio of 2wt%, and is fully stirred with a magnetic stirrer to disperse uniformly, to obtain a dispersion liquid, the dispersion liquid is placed in an ultrasonic crusher to perform peeling at an ultrasonic intensity of 450W, after the ultrasonic ends, the solution is cooled to room temperature, and the next peeling is performed at the same ultrasonic intensity, the ultrasonic peeling-cooling is repeated 3 times, and the ultrasonic time of each time is controlled to be about 5min, finally the mixed liquid is centrifuged and dried to obtain montmorillonite nanosheets with a sheet diameter of about 300nm and an average thickness of below 4nm.

[0043] Preparation of hydrotalcite nanosheets: The preparation method disclosed in the patent with the authorized publication number CN112661180B is used, specifically: (1) synthesis of NiFe hydrotalcite precursor: Ni 2+ and Fe 3+ are added into a reactor in a certain molar ratio (2:1) and mixed uniformly, an alkaline solution (NaOH, concentration 0.2mol / L) is slowly added dropwise, the pH of the solution in the reactor is maintained at about 10, and the crystallization is maintained at room temperature for 10h, after the reaction is completed, the product is washed by centrifugation with water and dried to obtain the NiFe-LDH hydrotalcite precursor.

[0044] (2) ultrasonic suspension method for preparing ultrathin nanosheets: the NiFe-LDH hydrotalcite precursor is uniformly dispersed in water to obtain a neutral dispersion liquid of 10mg / mL, a drop of the dispersion liquid is placed in an ultrasonic suspension instrument, the resonant frequency of the ultrasonic suspension instrument is adjusted to 10000Hz, the liquid drop is suspended in the air, after the suspension is successful, the liquid drop does not contact the ultrasonic suspension instrument, after 10min of suspension, the dispersion liquid is neutral during the suspension process, and the liquid drop is collected, to obtain hydrotalcite nanosheets with a sheet diameter of about 80nm and a thickness of about 1.2nm.

[0045] Example 1

[0046] A new energy automobile power battery cooling liquid, the raw material composition is: ethylene glycol 50%, benzotriazole 2%, 2, 6-di-tert-butyl-p-cresol 0.3%, sodium hydroxide 0.3%, antifoaming agent 0.03%, nano additive 0.01%, deionized water makes up the balance to 100% by mass percentage;

[0047] The nano additive includes hydrotalcite nanosheet, nano palygorskite and nano diamond with a mass ratio of 4:0.2:0.1.

[0048] The nano palygorskite has a mesh number of 20000 meshes and is purchased from Huachuan Mineral Products Direct Store.

[0049] The nano diamond has a particle size of 50 nm and is purchased from Beijing Deke Island Gold Technology Co., Ltd.

[0050] The antifoaming agent is an organic silicon defoaming agent: Addital FX580, purchased from Yihua High-tech (Nanjing) Co., Ltd.

[0051] The preparation method of the above new energy automobile power battery cooling liquid is to mix ethylene glycol, benzotriazole, 2, 6-di-tert-butyl-p-cresol, sodium hydroxide, antifoaming agent, nano additive and deionized water in proportion and uniformly.

[0052] Example 2

[0053] A new energy automobile power battery cooling liquid, the raw material composition is: ethylene glycol 50%, benzotriazole 2%, 2, 6-di-tert-butyl-p-cresol 0.3%, sodium hydroxide 0.3%, antifoaming agent 0.03%, nano additive 0.01%, deionized water makes up the balance to 100% by mass percentage;

[0054] The nano additive includes hydrotalcite nanosheet, nano palygorskite and nano diamond with a mass ratio of 4:0.2:0.1.

[0055] The nano palygorskite has a mesh number of 20000 meshes and is purchased from Huachuan Mineral Products Direct Store.

[0056] The nano diamond has a particle size of 50 nm and is purchased from Beijing Deke Island Gold Technology Co., Ltd.

[0057] The antifoaming agent is an organic silicon defoaming agent: Addital FX580, purchased from Yihua High-tech (Nanjing) Co., Ltd.

[0058] The preparation method of the above new energy automobile power battery cooling liquid is to mix ethylene glycol, benzotriazole, 2, 6-di-tert-butyl-p-cresol, sodium hydroxide, antifoaming agent, nano additive and deionized water in proportion and uniformly.

[0059] Example 3

[0060] A new energy automobile power battery cooling liquid, the raw material composition is: ethylene glycol 50%, benzotriazole 2%, 2, 6-di-tert-butyl-p-cresol 0.3%, sodium hydroxide 0.3%, antifoaming agent 0.03%, nano additive 0.01%, deionized water makes up the balance to 100% by mass percentage;

[0061] The nano additive includes hydrotalcite nanosheet, montmorillonite nanosheet, nano palygorskite and nano diamond with a mass ratio of 2:2:0.2:0.1.

[0062] The nano palygorskite has a mesh number of 20000 meshes and is purchased from Huachuan Mineral Products Direct Store.

[0063] The nano diamond has a particle size of 50 nm and is purchased from Beijing Deke Island Gold Technology Co., Ltd.

[0064] The antifoaming agent is an organic silicon defoaming agent: Addital FX580, purchased from Yihua High-tech (Nanjing) Co., Ltd.

[0065] The preparation method of the above new energy automobile power battery cooling liquid is to mix ethylene glycol, benzotriazole, 2, 6-di-tert-butyl-p-cresol, sodium hydroxide, antifoaming agent, nano additive and deionized water in proportion and uniformly to obtain.

[0066] Example 4

[0067] A new energy automobile power battery cooling liquid, the raw material composition is: ethylene glycol 50%, benzotriazole 2%, 2, 6-di-tert-butyl-p-cresol 0.3%, sodium hydroxide 0.3%, antifoaming agent 0.03%, nano additive 0.01%, deionized water makes up the balance to 100% by mass percentage;

[0068] The nano additive includes hydrotalcite nanosheet, montmorillonite nanosheet, nano palygorskite and nano diamond with a mass ratio of 1.5:1.5:0.1:0.3.

[0069] The nano palygorskite has a mesh number of 20000 meshes and is purchased from Huachuan Mineral Products Direct Store.

[0070] The nano diamond has a particle size of 50 nm and is purchased from Beijing Deke Island Gold Technology Co., Ltd.

[0071] The antifoaming agent is an organic silicon defoaming agent: Addital FX580, purchased from Yihua High-tech (Nanjing) Co., Ltd.

[0072] The preparation method of the new energy automobile power battery cooling liquid is that ethylene glycol, benzotriazole, 2,6-di-tert-butyl-p-cresol, sodium hydroxide, an antifoaming agent, a nano additive and deionized water are uniformly mixed in proportion.

[0073] Example 5

[0074] A new energy automobile power battery cooling liquid, in terms of mass percentage, is composed of ethylene glycol 50%, benzotriazole 2%, 2,6-di-tert-butyl-p-cresol 0.3%, sodium hydroxide 0.3%, an antifoaming agent 0.03%, a nano additive 0.01%, and deionized water to make up the rest to 100%.

[0075] The nano additive includes hydrotalcite nanosheet, montmorillonite nanosheet, nano-palygorskite and nano-diamond in a mass ratio of 2.5:2.5:0.5:0.2.

[0076] The nano-palygorskite has a mesh number of 20000 and is purchased from Huachuan Mining Products Direct Store.

[0077] The nano-diamond has a particle size of 50 nm and is purchased from Beijing Deke Island Gold Technology Co., Ltd.

[0078] The antifoaming agent is an organic silicon defoaming agent: Addital FX580, which is purchased from Yihua High-tech (Nanjing) Co., Ltd.

[0079] The preparation method of the new energy automobile power battery cooling liquid is that ethylene glycol, benzotriazole, 2,6-di-tert-butyl-p-cresol, sodium hydroxide, an antifoaming agent, a nano additive and deionized water are uniformly mixed in proportion.

[0080] Comparative Example 1

[0081] The difference from Example 3 is that the nano additive includes hydrotalcite nanosheet, montmorillonite nanosheet and nano-diamond in a mass ratio of 2:2:0.3; and the rest is the same.

[0082] The preparation method of the new energy automobile power battery cooling liquid is the same as that in Example 3.

[0083] Comparative Example 2

[0084] The difference from Example 3 is that the nano additive includes hydrotalcite nanosheet, montmorillonite nanosheet and nano-palygorskite in a mass ratio of 2:2:0.3; and the rest is the same.

[0085] The preparation method of the new energy automobile power battery cooling liquid is the same as that in Example 3.

[0086] Comparative Example 3

[0087] The difference from Example 3 is that the nano additive comprises hydrotalcite nanosheets, montmorillonite nanosheets, nanometer palygorskite and nanometer diamond in a mass ratio of 3:3:0.6:0.1; the rest are the same.

[0088] The preparation method of the new energy automobile power battery coolant is the same as that of Example 3.

[0089] Comparative Example 4

[0090] The difference from Example 3 is that the nano additive comprises hydrotalcite nanosheets, montmorillonite nanosheets, nanometer palygorskite and nanometer diamond in a mass ratio of 3:3:0.6:0.1; the rest are the same.

[0091] The preparation method of the new energy automobile power battery coolant is the same as that of Example 3.

[0092] Comparative Example 5

[0093] The difference from Example 3 is that the nano additive comprises hydrotalcite nanosheets, montmorillonite nanosheets, nanometer palygorskite and nanometer diamond in a mass ratio of 3:3:0.6:0.1; the rest are the same.

[0094] The preparation method of the new energy automobile power battery coolant is the same as that of Example 3.

[0095] Comparative Example 6

[0096] The difference from Example 3 is that the anti-foaming agent is an organic silicon defoaming agent: DOWSIL TW 62, purchased from Shanghai Kaishida Chemical New Material Co., Ltd.; the rest are the same.

[0097] The preparation method of the new energy automobile power battery coolant is the same as that of Example 3.

[0098] The new energy automobile power battery coolants obtained in Examples 1-5 were tested for freezing point (test method: SH / T0090), boiling point (test method: SH / T0089), electrical conductivity (test method: GB29743.2), storage stability (test method: GB29743.2), and thermal conductivity (test method: using a thermal conductivity tester to test): the test results are shown in Table 1:

[0099] Table 1

[0100]

[0101] As can be seen from Table 1, the new energy automobile power battery cooling liquid of Examples 1-5 has good storage stability, lower electrical conductivity, higher thermal conductivity and wide use temperature range; as can be seen from Examples 1-3, Example 3 shows a synergistic effect due to the use of both hydrotalcite nanosheets and montmorillonite nanosheets, and the thermal conductivity is significantly improved compared with Examples 1 and 2.

[0102] The new energy automobile power battery cooling liquid obtained from Comparative Examples 1-6 was tested for electrical conductivity (test method: GB 29743.2), storage stability (test method: GB 29743.2) and thermal conductivity (test method: tested using a thermal conductivity tester): the test results are shown in Table 2:

[0103] Table 2

[0104]

[0105] As can be seen from Table 2, in Comparative Example 1, nano-palygorskite is replaced by the same amount of nano-diamond, i.e. the amount of nano-diamond is increased, which not only does not improve the thermal conductivity, but also causes precipitation and increases the electrical conductivity. In Comparative Example 2, nano-diamond is replaced by the same amount of nano-palygorskite, which significantly reduces the thermal conductivity. In Comparative Example 3, hydrotalcite nanosheets and montmorillonite nanosheets are replaced by ordinary nano-stone powder and nano-bentonite, which causes precipitation and significantly reduces the thermal conductivity. In Comparative Example 4, the mass ratio of hydrotalcite nanosheets, montmorillonite nanosheets, nano-palygorskite and nano-diamond is not within the preferred range, which causes precipitation, increases the electrical conductivity and significantly reduces the thermal conductivity. In Comparative Example 5, nano-palygorskite is replaced by the same amount of halloysite nanotubes, which causes precipitation and significantly reduces the thermal conductivity. In Comparative Example 6, the model of the organic defoaming agent is replaced, which causes sedimentation.

[0106] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application. Simple modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A new energy vehicle power battery cooling liquid, characterized in that, The raw materials include, by mass percentage: dihydric alcohol 40-60%, corrosion inhibitor 0.2-3%, antioxidant 0.1-0.5%, pH regulator 0.1-0.5%, antifoaming agent 0.01-0.05%, nano additive 0.005-0.015%, and deionized water to make up the balance to 100%; The nano additive includes ion-type sheet-shaped nano mineral, nano palygorskite, and nano diamond at a mass ratio of 3-5:0.1-0.5:0.1-0.5; The ion-type sheet-shaped nano mineral includes montmorillonite nanosheet and / or hydrotalcite nanosheet; The dihydric alcohol includes ethylene glycol and / or propylene glycol; The antifoaming agent is a silicone antifoaming agent; the antifoaming agent is Addital FX580.

2. The new energy vehicle power battery cooling liquid according to claim 1, characterized in that, The montmorillonite nanosheet has a sheet diameter less than 600 nm and a thickness less than 10 nm.

3. The new energy vehicle power battery cooling liquid according to claim 1, characterized in that, The hydrotalcite nanosheet has a sheet diameter of 50-100 nm and a thickness of 0.5-2 nm.

4. The new energy vehicle power battery cooling liquid according to claim 1, characterized in that, The ion-type sheet-shaped nano mineral includes montmorillonite nanosheet and hydrotalcite nanosheet at a mass ratio of 1:

1.

5. The new energy vehicle power battery cooling liquid according to any one of claims 1-4, characterized in that, The nano palygorskite has a particle size less than 1000 nm.

6. The new energy vehicle power battery cooling liquid according to any one of claims 1-4, characterized in that, The nano diamond has a particle size less than 100 nm.

7. The preparation method of the cooling liquid for new energy vehicle power battery according to any one of claims 1-6, characterized in that, The method includes the following steps: mixing dihydric alcohol, corrosion inhibitor, antioxidant, pH regulator, antifoaming agent, nano additive, and deionized water in proportion to obtain the product.

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